Robtex

Up: 192.235.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 192.235.4.0/23
Down right: 192.235.6.0/23

IP	Type	Hostname
192.235.4.2	PTR	fourdot2.dvc.edu
192.235.5.2	PTR	fivedot2.dvc.edu
192.235.5.136	PTR	fivedot136.dvc.edu
192.235.5.238	PTR	fivedot238.dvc.edu
192.235.5.239	PTR	fivedot239.dvc.edu
192.235.6.2	PTR	sixdot2.dvc.edu
192.235.6.12	PTR	sixdot12.dvc.edu
192.235.7.2	PTR	sevendot2.dvc.edu
192.235.7.5	PTR	sevendot5.dvc.edu
192.235.7.50	PTR	sevendot50.dvc.edu
192.235.7.102	PTR	sevendot102.dvc.edu